From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Garzik Subject: Re: Which raid card to buy for Sarge Date: Wed, 31 Mar 2004 15:59:26 -0500 Sender: linux-raid-owner@vger.kernel.org Message-ID: <406B312E.1030006@pobox.com> References: <200403312242.49462.ralph@debianbase.de> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <200403312242.49462.ralph@debianbase.de> To: =?ISO-8859-1?Q?Ralph_Pa=DFgang?= Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids Ralph Pa=DFgang wrote: > kernel code). But normaly a real hardware raid is without a doubt fas= ter than=20 > a software raid. Well... Regardless of hardware or software RAID, the kernel I/O limits= =20 and the drive I/O limits are the main limiting factor. Hardware RAID=20 mainly helps for RAID1 and RAID5 writes, eliminating duplicate copies o= f=20 data going across the PCI bus... at the expense of relinquishing contro= l=20 over your data to the hardware RAID's firmware. A UDMA/133 PATA hardware RAID from a large company I won't mention is=20 quite a bit slower than any SATA software RAID that I've tested... Jeff - To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html